<VV> Prefered motor for 65 Monza 4speed? (John Gull)

[James Davis]

I found a relative stock 140 with the 304 cam and a 3.27 rear gear
(195/70-14 tires and a 3.20:1 first gear) doesn't make a good  in-town
combination.  Just the slightest hill with 3  150 lb passengers requires a
lot of clutch slippage to get the car moving.   It takes at least 2,500 rpm
to get the engine up on the cam.  That said it makes a great highway cam,
still pulling strong @ 75 mph in 3rd.  As for me, I spent the extra money
for a 190 cuin Corvair 140 with Michael LeVeque heads and a Ray Sedman 286
cam.  Now that motor has plenty of torque to pull a 3.27 rear gear with the
3.20:1 1st gear.

On Sun, Oct 15, 2017 at 1:30 PM, Dale Dewald via VirtualVairs <
virtualvairs at corvair.org> wrote:

> On 10/12/2017 12:00, John Gull wrote:
>
> Now to consider a standard140 or a PG140  with Standard shift bell housing
>>> for my 4 speed car! I have both motors and they both will need rebuilding
>>> before using in my 4 speed Monza. Which would you all prefer to use and why
>>> one over the other? Thanks in advance for your reccomendations John in NC
>>> pondering this age old question!
>>>
>> Hello John,
> I think the decision on which motor to rebuild [which really boils down to
> what cam to install] depends on how you will be using your car and what
> differential ratio and transmission you have [or want to  build].
>
> Please first determine what differential you have.  If the car was
> originally optioned with a 140 engine then it most likely will have a
> 3.55:1 R&P ratio.  If it had a 110, then it will likely have a 3.27:1
> ratio.  These often get changed during the 50+ year life of the car so it
> is necessary to count teeth or measure turns to find out what is in there.
> If you plan to also rebuild the differential and/or the transmission then
> there is the option to install a 3.08:1 [OTTO parts] R&P gear.
>
> For s street car with a 3.55:1 differential you will want to rebuild the
> standard 140 with the factory 891 or 304 cam or Isky 270, OTTO OT-20, or
> similar mild performance cam.  There might be some newer cams to consider.
> In this case you will want to use the the stock '65 transmission [3.20:1
> first gear].
>
> For a street car with the 3.27:1 differential and stock '65 transmission
> there is more to consider.  You might want to build in a little more low
> end torque with the 140 engine by using one of the mild performance cams
> (OT-20, 270, etc) with a modest 2 degree advance.  This can be done with an
> offset key on the cam gear.  Talk to your engine builder about this,
> especially if he can do some computer modeling.
>
> If you build a 3.08:1 differential to make a highway cruising car then you
> will also want to build a custom '65 4-speed using the gearset from the
> 64-65 FC with a 3.65:1 first gear.  Then you will want to build a 140PG
> type engine using a low performance engine cam; GM 889, OT-10, Isky 260,
> etc (consider also a special torque cam sold by Ken Hand) installed in the
> engine with a 4 degree retard.  Your 140PG engine will have the correct
> retarded gear already installed on the crankshaft.  Use this crank with the
> cam of your choice.
>
> FWIW, my wife's '65 Monza has a '65 FC transmission and 3.08:1
> differential installed behind a rebuilt +0.060 over 110 engine. This is a
> very nice combination for a road car. The added torque from the bored
> engine makes this combination work.  Some improvements to the stock heads
> would likely yield even greater performance with the comfortable cruising
> RPM's of the 3.08.  I have yet to go on a really long trip with this car to
> find out what MPG it is able to get.
>
> For more specific information you may email me directly.
>
> Dale Dewald
> Hancock, MI
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